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Stories by David Appell

Dark Forces at Work

Ten years ago two teams discovered that the universe will expand forever at an ever faster rate, thanks to an unseen energy. The leader of one of the groups, Saul Perlmutter, expects that new observations will soon illuminate the universe's dark side

May 1, 2008 — David Appell

Behind the Hockey Stick

Seven years ago Michael Mann introduced a graph that became an iconic symbol of humanity's contribution to global warming. He has been defending his science ever since

March 1, 2005 — David Appell

Father of Spirit and Opportunity

With the success of twin rovers on the Red Planet, Steven W. Squyres and his team are showing how to conduct robotic missions--and setting the stage for human exploration

October 1, 2004 — David Appell

Hot Words

A claim of nonhuman-induced global warming sparks debate

August 1, 2003 — David Appell

Know Before You Vote

Know Before You Vote